Finding the Fourth Proportional to 3,783.78, 5,221.26 and 2,105.06

Step by Step Solution

1. Step 1: Write the proportion equation
   3,783.78 : 5,221.26 = 2,105.06 : x
2. Step 2: Convert to fraction form
   3,783.78/5,221.26 = 2,105.06/x
3. Step 3: Cross multiply
   3,783.78x = 5,221.26 × 2,105.06
4. Step 4: Simplify right side
   3,783.78x = 10,991,039.47
5. Step 5: Solve for x
   x = 10,991,039.47/3,783.78
6. Step 6: Final answer
   x = 2,904.78